Database connection - Layout with subtopics?

I want to interface to an Excel "database" and produce a map with major topics corresponding to one field and subtopics corresponding to other field... but I cant seem to make it work.
In the Database Configuration it looks right - but only the main Field is added as Topic - no subtopics (this also goes for the Sample Database, if I drag fields to be subtopics).

I think this is by design. I just tried to make this work, but selecting fields to be shown in topic text just shows the text in the main topics. If you select multiple fields to be shown in the topic text you'll get a bunch of main topics with a lot of text in them, but not a main topic - sub topic structure.